Service Status

What’s included in the price?

  • Finger prick kit
  • Postage & packaging
  • Accredited lab analysis
  • Results within 2 working days of receipt
  • Market leading results dashboard
  • Reviewed by a doctor or nurse

What The Test Identifies

This test measures total testosterone which is a combination of both free and bound testosterone. Testosterone is produced by both men and women, although men have much higher levels of testosterone than women. The normal level of testosterone in adult men is between 8.64 to 29 nmol/L, in adult women it is usually between 0.29 and 1.67 nmol/L. Testosterone outside of these normal ranges can lead to a range of symptoms.

Testosterone Levels in Men

As men age their testosterone level in particular will drop, so that by the age of forty, your testosterone level can be half that of a twenty year old. Over-training and/or under fuelling in exercise can also result in low testosterone levels.

Low levels of testosterone in men can lead to fatigue, low mood, trouble sleeping, decreased libido, reduced muscle mass, increased risk of injury e.g. stress fractures, increased propensity to gain fat, increased risk of diabetes and cardiovascular disease.

High levels of testosterone in men can lead to a lower sperm count affecting fertility. In addition, taking too many steroids to aid sports performance can cause the body to stop producing testosterone.

Testosterone Levels in Women

Low levels of testosterone in women can lead to irregular or missed periods, decreased libido, vaginal dryness, osteoporosis and infertility.

High levels of testosterone in women can be a consequence of Polycystic Ovary Syndrome (PCOS).

In both cases, establishing your levels of testosterone is a positive first step towards treating any issues and ultimately eliminating the symptoms caused by low or high levels of testosterone.

Why Measure Testosterone

You are feeling low in energy and mentally and physically fatigued

You are experience low mood/libido and what to check if low testosterone could be a contributing factor.

Strength and Muscle Density
You’re finding it more difficult to build muscle and want to check if it is due to a fall in testosterone levels

Optimal Performance
You are training for an event and want to check you have the right balance between nutrition, training and recovery.

Testosterone Supplements
If you are taking a testosterone supplement on advice and guidance of medical doctor and want to check the impact of this on your testosterone levels.

Biomarkers included

When to take this test

Testosterone is highest in the morning so the sample for this test is best taken between 8-10am before food.

“Testosterone is a sex steroid hormone found in both men and women, although higher levels in men. Levels in both men and women decline from middle age. Informing yourself of your testosterone level can helps you to understand if your value is as expected, low or high for your age and biological sex. Your result can then be considered in context of any symptoms you are experiencing, and tailored advice given to address any issues identified. This might include resistance type exercise to support testosterone levels, and/or considering dietary intake matches demands from exercise training .”

Dr Nicola Keay, BA, MA (Cantab), MB, BCHIR, MRCP

Please note for those competing in sport, testosterone is on WADA banned list.

Frequently Asked Questions

What is a normal testosterone level in a man?

The normal level of testosterone in adult men is between 8.64 to 29 nmol/L.

What is a normal testosterone level in a woman?

The normal level of testosterone in adult women it is usually between 0.29 and 1.67 nmol/L.

How is the testosterone test sample collected?

Once you have purchased your test online it will arrive in a box that easily fits through your letter box. The kit contains everything you need to carry out your finger prick blood test at home, complete with detailed instructions. Once you have completed your test, simply put it in the pre-paid envelope and post back to us.The tests are carried out by our accredited labs and reviewed by a GP or nurse. Your results will be available in the Forth app within 2 working days of receipt.

How often should I check my testosterone level?

We recommend that you test your testosterone levels every 3 to 4 months to establish your own personal levels.

Can I increase my testosterone levels naturally?

Yes. Strength and resistance type exercise supports production of testosterone*.

Do I need to take a testosterone supplement if my level is low?

Only on advice and guidance of medical doctor. For those competing in sport, testosterone is on WADA banned list.

*Reference: Endocrinology of Physical Activity and Sport, Third Edition 2020.

For further information on how to collect a blood sample and FAQs please visit our Help page.

When to take this test

Testosterone is highest in the morning so the sample for this test is best taken between 8-10am before food.

How it works

  • 1

    Collect your sample

    The kit includes everything you need to safely and simply collect your finger-prick blood sample, including instructions and CE marked equipment.

  • 2

    Post sample

    We’ll supply you with a Tracked 24 Returns envelope to post your sample direct to the lab using a priority post box.

  • 3

    Accurate results in 48hrs

    Your results will be reviewed by our team of registered doctors and made available with any comments on your secure dashboard.

How to collect your blood sample

You’re in control

Gain an in depth understanding of your health.

From identifying hormone imbalances to uncovering any vitamin and mineral deficiencies, we help you gain real insight.

Your Results

Your results will be published on your secure digital dashboard for you to access on demand.

Actionable Insights

Clear explanations about each market checked and how it affects your health. Out of range markers will be reviewed by one of our doctors.

Track Changes Over Time

Track your biomarker levels over time. Every time you perform one of our tests, your results are stored in your secure dashboard so you can identify trends and changes over time.

Why Forth?

  • Fast & Accurate

    Fast & accurate analysis from accredited laboratory

  • Convenient

    Convenient tests can be done at home

  • Secure

    Secure access to online results

  • Online dashboard

    Online dashboard which tracks results over time

What our customers say

This should be the most common thing people do.
Great company, easy to read results. Well worth it. The cost is an investment


Really excellent service - we bought two 'vitality' tests after reading about Forth With Life in Natural Health magazine. The packs came quickly, the phlebotomy appointment at home was convenient and professional and the results were quick and insightful- I recommend without reservation to anyone wishing to gain a comprehensive understanding of biomarkers indicative of their health and wellness!

Kate W

Very fast service, a fair cost, comprehensive results and an unexpectedly lengthy comment from a Dr about the findings.

I'll definitely be ordering again on a regular basis to keep an eye on things.

James S

Really fast and reliable results.So easy to use! Have used them3 times now and will continueto use this company, amazing.


An excellent service, I got fast replies to my enquires and immediate practical solutions. I needed my results quickly after being unable to get samples on my first attempt and Forth found a resolution for me and assisted at each stage. Really great communication from individuals who have the knowledge and ability to sort things out. Wouldn't go anywhere else.


The service was great from beginning to end. The test kit arrived quickly and was easy to use, the instructions were clear and simple to follow and my results were available sooner than I expected. Thanks everyone!


Wasn’t feeling quite right and believed I may be chronically stressed. Took the baseline plus option which is a wider range of tests and this confirmed by expectations and also highlighted two further issues which I’ve raised with my GP. Well worth the piece of mind.


Quick delivery and clear instructions - I sent the samples off on Thursday and received the results on Saturday. The information on each statistic was clear, and the recommendations helpful. Will definitely be following up in half a year!


I enlisted the help of Forth to help me get to the bottom of my current health concerns. The test was really easy to and my results were available within day. Using Forth has helped me take the action needed to get my hormones back on track.

Holly Rush, 39

Fast easy service putting my mind at rest quickly. Sent off sample on Monday, got results back Tuesday afternoon.


Taking the test is simple just make sure you follow all the instructions so you follow the correct procedures. The customer service is second to none and the results are easy to understand and follow.

Matthew Bottrill

Efficient, great communication and information. Very fast, next day turnaround. Very, very pleased. Highly recommended and best value I have found.


I suffer from a hereditary condition which causes my body to store too much iron.  My biggest issue before using Forth was getting an appointment with my GP.  Now using Forth I can track my iron quickly and easily and take action before levels start to affect my health

Mark Threfall, 29

I'd put off getting regular blood tests before because of the long-winded process of a GP visit. Forth has changed all that. The process is very quick and very easy, with thorough, well-explained results delivered to your inbox within days.

Alice Hector

This was a really simple and quick process. I ordered the test kit, it arrived 2 days later. I did my blood test a few days later and put it straight in the post. My results were with me 3 days later. Brilliant. The dashboard is very well presented and gave me a clear view of each marker. I’m not happy with all the results, but that’s not Forth with Life’s fault. That’s down to my own body!

Mrs Heidi Tyler

The kindest customer service I have ever experienced. Would definitely recommend to anyone looking for these products.

Thank You so much for your prompt responses and helping me with my order.

Much appreciated.

Mrs Mahendran

As a working mum, I often find myself training ‘tired’ as the demands of day-to-day life take their toll.  Forth has enabled me to gain a valuable insight into what is happening ‘under the surface’, so I  can adapt my training and lifestyle.

Kate Allan

Any questions I had, I emailed to the email contact and I was answered within hours. I was really impressed with the level of service and manner of response. I believe the product is very good quality and plan to utilize more of the products in the future. The process is very simple and reliable!


Forthwithlife are just so helpful - professional and extremely easy to deal with. I would highly recommend these guys and would literally never look anywhere Else. Superb company.


First time using a service like this looked at reviews previously before purchasing, happy to see the five stars reviews are reflective of the service. The kit arrived the next day after ordering I waited till the Monday to do the sample sent it off Monday AM and had the results back Tuesday PM. Wow what a quick service! Follow the tips about doing the blood sample and you shouldn’t have any issues, I found I only needed one lancet and the blood flowed freely after a hot shower and running my hands under warm water. I will definitely be using this service again as I got some surprising results which I’d like to see improve.


As a former Olympic cyclist I always wanted to look after my health. This has never changed to this day but become a lot easier via Forth, it’s the only way to really understand your own body. 

Brian Smith

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